localrepo: drop the CamelCase name for `localrepo.ilocalrepositorymain`

See 61557734c0ae for the reasoning.  This one is slightly different, however,
because the `localrepository` class already subclasses the interface class in
the type checking phase.

mercurial/localrepo.py

@@ -83,7 +83,6 from .branching import (
 
 from .interfaces import (
     repository,
-    util as interfaceutil,
 )
 
 from .utils import (
@@ -1304,7 +1303,7 if typing.TYPE_CHECKING:
     ]
 
 
-class LocalRepository(_localrepo_base_classes):
+class localrepository(_localrepo_base_classes):
     """Main class for representing local repositories.
 
     All local repositories are instances of this class.
@@ -3606,15 +3605,6 class LocalRepository(_localrepo_base_cl
         self._sidedata_computers[kind][category] = (keys, computer, flags)
 
 
-localrepository = interfaceutil.implementer(repository.ilocalrepositorymain)(
-    LocalRepository
-)
-
-if typing.TYPE_CHECKING:
-    # Help pytype by hiding the interface stuff that confuses it.
-    localrepository = LocalRepository
-
-
 def undoname(fn: bytes) -> bytes:
     base, name = os.path.split(fn)
     assert name.startswith(b'journal')